Abstract

To further explore the possibility of the electrochemical reduction of NaBO₂ into NaBH₄, the electrochemical reduction of NaBO₂ into NaBH₄ was fulfilled with pulse voltage using the Eu-Co-Ni-B coating electrode. A simple electroless plating technique was used to prepare the Eu-Co-Ni-B coating electrode. It has been proved that NaBO₂ was converted into NaBH₄ by electrochemical analysis method. The results showed that the method of detection and quantitative analysis of NaBH₄ with gold electrode was feasible (R²=0.98). When the reverse pulse voltage was + 0.5 V, the forward pulse voltage was −1.5 V, the reverse pulse duration was 2 s and the forward pulse duration was 2 s, the concentration of NaBH₄ reaches a maximum of 1.25 × 10⁻⁴mol/L. With the continuous increase of electrolytic time, the concentration of NaBH₄ shows a trend of increasing first and then decreasing. When the electrolytic time was 2 h, the maximum concentration of NaBH₄ reaches 1.61 × 10⁻⁴mol/L.

摘要

为了进一步探索将NaBO ₂电化学还原为NaBH ₄的可能性，使用Eu-Co-Ni-B涂层电极通过脉冲电压将NaBO ₂电化学还原为NaBH _{4 。}采用简单的化学镀技术制备 Eu-Co-Ni-B 涂层电极。电化学分析方法证明NaBO ₂转化为NaBH ₄。结果表明，采用金电极对NaBH _{4进行检测和定量分析的方法是可行的（R} ²=0.98）。当反向脉冲电压为+0.5 V，正向脉冲电压为-1.5 V，反向脉冲持续时间为2 s，正向脉冲持续时间为2 s时，NaBH ₄的浓度达到最大值1.25×10 ^-4 mol /L。随着电解时间的不断增加，NaBH ₄的浓度呈现先升高后降低的趋势。当电解时间为2 h时，NaBH ₄的最大浓度达到1.61×10 ^-4 mol/L。